Isoniazid use, effectiveness, and safety for treatment of latent tuberculosis infection: a systematic review

Sodré-Alves, Bárbara Manuella Cardoso; Toledo, Melina Mafra; Zimmermann, Ivan Ricardo; Araújo, Wildo Navegantes de; Tavares, Noemia Urruth Leão

doi:10.1590/0037-8682-0504-2023

ABSTRACT

Background: The treatment strategy for latent tuberculosis infection is to reduce the number of tuberculosis cases and consequently reduce the transmission of pathogenic bacteria. This study aimed to determine the safety, effectiveness, and adherence of isoniazid use for latent tuberculosis infection treatment.

Methods: To identify studies on isoniazid use for latent tuberculosis infection, five electronic databases were searched. The methods and results are presented in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines.

Results: Most studies (53) used isoniazid for 9 months. The prevalence of use and adherence to treatment varied considerably (18% to 100%), and were evaluated by participant completion of isoniazid treatment for latent tuberculosis infection. The adverse events most frequently reported were hepatotoxicity, gastric intolerance, and neuropathy; the rates of occurrence ranged from < 1% to 48%. In the studies that evaluated the effectiveness of isoniazid for latent tuberculosis infection, the rate varied from 0 to 19.7% for patients who did not have active tuberculosis after the follow-up period.

Conclusions: The importance of maintaining follow up for patients using isoniazid should be emphasized due to the risk of developing adverse events. Despite the treatment challenges, the rates of patients who used isoniazid and developed active tuberculosis during the follow-up period were low. We believe that isoniazid continues to contribute to tuberculosis control worldwide, and better care strategies are required.

Keywords: Latent tuberculosis infection; Isoniazid; Treatment adherence; Medication safety; Treatment effectiveness

INTRODUCTION

Latent infection with Mycobacterium tuberculosis (LTBI) refers the moment when the individual is infected, and is characterized by a state of persistent immune response to stimulation by bacterial antigens with no clinical manifestations of tuberculosis (TB)¹^-³.

Within the context of the world strategy to end TB proposed by the World Health Organization (WHO), a reduction in the number of cases that evolve from LTBI to TB is one of several ways to achieve this objective⁴^-⁶. Isoniazid (INH) is a medication used in TB preventive treatment (TPT) for individuals diagnosed with LTBI⁷^,⁸. Patients who adhere to the treatment for the requisite period can have a 60% to 90% reduction in the risk for clinical manifestations and the potential to transmit the bacteria to their close contacts⁹.

The number of individuals undergoing preventive TB treatment has quadrupled since 2015 from 1 million in 2015 to > 4 million in 2019⁵^,¹⁰^-¹². However, the coronavirus disease 2019 (COVID-19) pandemic in 2020 has had a significant impact on TB services. Data collected by the WHO from countries with a high TB burden demonstrated sharp drops in TB notifications in 2020 and, consequently, in LTBI screenings and preventive treatment¹². Only 15.5 million people initiated TPT, 52% of the 5-year (2018-2022) target of 30 million¹. This included 3.8 million people in 2022, which was above the pre-pandemic level of 3.6 million in 2019¹.

However, the challenges in treating LTBI are not limited to the COVID-19 health emergency other factors influence the performance of programs to prevent the disease. Several studies have demonstrated how safety (addressing adverse reactions during treatment and drug interactions) and adherence to treatment by the user (who is not affected by symptoms but must use medication daily for months) can influence the efficacy of LTBI treatment¹³^-¹⁷.

Understanding the global scenario and the data reported in scientific studies is important for identifying ways to help health managers and services improve TPT with INH and, in turn, promote a reduction in TB transmission rates. The present study aimed to determine the safety, effectiveness, and adherence to INH use for LTBI treatment as reported in scientific studies.

METHODS

This systematic review was conducted between January 2020 and March 2022 in accordance with the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines¹⁸. The study protocol was registered with PROSPERO¹⁹ under number CRD 42020176694.

● Research question

What is the use adherence, effectiveness, and safety of INH for the treatment of LTBI?

To explain the clinical issue, the eligibility criteria and the research strategy were based on the PI(E)CO (population, intervention [exposure], comparison, and outcome) elements, as follows: population, LTBI; exposure, INH; comparison, not applicable; and outcome, safety, effectiveness and adherence²⁰.

● Data sources and search strategy

A comprehensive literature search of the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed/Medline, Embase, Literatura Latino-Americana e do Caribe em Ciências da Saúde (LILACS), Scopus, and Web of Science databases was performed for articles published from inception to March 2020. Articles were searched using Medical Subject Headings (MeSH) descriptors and other non-standard descriptors, including: “Latent Tuberculosis” and “Isoniazid.” The descriptors were adapted for each database and combined using the Boolean operators “OR” and “AND.” The words used in the search are listed in Supplementary Table 1 The terms searched for the prevalence of INH use for LTBI.

● Inclusion and exclusion criteria

Descriptive and analytical observational studies that fulfilled the following criteria were included: use of INH for LTBI; determined rate of use of INH; published in English, Portuguese, or Spanish; and published from inception to March 2020.

Theoretical studies, systematic reviews, case reports, congress abstracts, letters to the editor, results, and award reports were excluded. Studies that addressed INH use only in pediatric patients, had methodological limitations that precluded analysis for the type and frequency of adverse reactions, and did not report an abstract or full text were also excluded. Studies indexed in ≥ 2 databases (duplicated) were considered only once.

● Study selection

After searching the databases, the selection process was performed in four stages: exclusion of pairwise and independent studies, analysis of article titles, evaluation of abstracts, full-text review of articles whose abstracts were selected, and manual screening of the references of the articles included after reading them in full. For stages 1 to 4, the studies were independently selected by two evaluators (BMCSA and MMT) using the Rayyan website²¹; for disagreements, a third evaluator analyzed and adjudicated the discrepancies. The overall degree of agreement between the evaluators at all stages was measured according to Rayyan and Cohen’s kappa (κ) index²².

● Data extraction

After article selection, the following data were extracted: author(s), year of publication, journal, study location, study type, study setting, study duration, type of sample selection, sample size, study limitations, clinical findings, rate of INH use, method for identifying adverse reactions, type of adverse reactions, severity of adverse reactions, rates of adverse reactions, management of adverse reactions, assessment of therapeutic responses, and other pertinent observations.

● Quality assessment

Evaluation of study quality - Quality assessment of the included observational cohort and cross-sectional studies was performed using the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies, for which 14 specific questions were answered with “Yes,” “No” and “Not applicable”²³. After analyzing the instrument responses, the evaluators classified the study quality as good, fair, or poor, and comments on the decisions were documented in the latter cases. All quality assessments of the studies included in this systematic review were performed by two independent reviewers (BMCSA and MMT), and discrepancies were resolved by the consensus decision-making process.

RESULTS

A total of 6051 potentially relevant studies were retrieved, 73 of which were included in this systematic review (Figure 1 and Supplementary Table 2)²⁴^-⁹⁵. In the title and abstract evaluation stage, there was virtually perfect agreement (95.4% [2611/2737]) between the articles; Cohen’s κ, 0.81), and in the evaluation of the full texts, there was virtually perfect agreement (92.5 % [347/390]; Cohen's κ: 0.84) between the evaluators.

FIGURE 1:
Study selection flowchart. INH: isoniazid; LTBI: latent tuberculosis infection.

● Study characteristics

The studies included in this systematic review were conducted across countries in five continents (Figure 2). Three of the included studies did not report where they were conducted⁵⁴^,⁶²^,⁸⁸. The most frequent settings were: outpatient clinics and clinics (n = 41)²⁴^-²⁶^,³⁰^,³⁵^-³⁸^,⁴⁰^-⁴³^,⁴⁶^-⁵²^,⁵⁶^-⁵⁸^,⁶¹^,⁶⁷^,⁶⁸^,⁷¹^-⁷³^,⁷⁵^,⁸¹^,⁸²^,⁸⁴^,⁸⁵^,⁸⁷^,⁸⁹^-⁹⁵; hospitals (n =19)²⁴^,²⁸^,³⁹^,⁴⁰^,⁴⁵^,⁵³^,⁵⁵^,⁵⁹^,⁶⁰^,⁶⁴^,⁶⁶^,⁷⁰^,⁷⁴^,⁷⁶^,⁷⁷^,⁸⁰^,⁷⁸^,⁷⁹^,⁸³; and penitentiaries (n = 4)²⁹^,³¹^,³³^,⁶³.

FIGURE 2:
Number of studies included, by continent.

Most of the included studies (n = 49) did not specify patient profiles²⁴^-³³^,³⁵^-³⁷^,⁴⁰^-⁴⁴^,⁴⁷^,⁴⁹^,⁵¹^,⁵²^,⁵⁴^,⁵⁵^,⁵⁷^-⁵⁹^,⁶⁰^,⁶³^-⁶⁵^,⁶⁷^,⁶⁸^,⁷⁰^,⁷¹^,⁷⁷^,⁷⁹^,⁸¹^-⁸⁷^,⁸⁹^,⁹⁰^,⁹³^,⁹⁴, four studies involved patients with inflammatory bowel disease or immune-mediated inflammatory diseases⁷²^,⁷³^,⁷⁶^,⁸⁰, four involved human immunodeficiency virus (HIV)-positive adults⁵⁶^,⁶¹^,⁷⁴^,⁹¹, four involved patients who transplanted or had transplants ³⁴^,⁵⁰^,⁶²^,⁶⁶, and six involved health professionals³⁸^,³⁹^,⁴⁵^,⁴⁸^,⁷⁸^,⁸⁸.

● Medications used

Regarding the various treatment alternatives for LTBI globally, among the studies analyzed, 53 used INH for 9 months²⁴^-²⁸^,³⁰^-³⁴^,³⁸^-⁴⁶^,⁴⁹^-⁵⁴^,⁵⁸^,⁶¹^,⁶³^,⁶⁴^,⁶⁷^,⁶⁹^,⁷²^-⁷⁴^,⁷⁶^,⁷⁷^-⁷⁹^,⁸⁰^,⁸¹^,⁸²^-⁸⁷^,⁸⁹^,⁹¹^,⁹²^,⁹⁴^,⁹⁵, 40 used INH for 6 months²⁴^,²⁶^,²⁷^,²⁹^,³⁴^-³⁶^,³⁹^,⁴²^-⁴⁴^,⁴⁷^-⁴⁹^,⁵³^,⁵⁵^,⁵⁶^,⁵⁷^,⁵⁹^-⁶²^,⁶⁴^,⁶⁵^,⁶⁷^,⁶⁸^,⁷⁰^,⁷¹^,⁷²^,⁷⁴^,⁷⁵^,⁸⁴^,⁸⁶^-⁹⁰^,⁹³^,⁹⁴^,⁹⁵, and two used INH for 12 months⁶⁶. Rifampicin monotherapy for 4 months was investigated in 28 studies²⁵^-²⁸^,³²^,³⁵^,³⁷^,⁴⁰^,⁴¹^,⁴³^,⁴⁴^,⁴⁵^,⁴⁸^,⁵¹^,⁵²^,⁵³^,⁵⁴^,⁵⁸^,⁶³^,⁶⁴^,⁶⁵^,⁶⁹^,⁷¹^,⁷⁶^-⁷⁸^,⁸¹^,⁹⁰^,⁷⁸ (Supplementary Table 2).

Among the combination therapies for LTBI, 11 studies used INH + rifampicin ⁴⁹^,⁶³^,⁷¹^,⁷⁴^-⁷⁶^,⁷⁸^,⁷⁹^,⁸¹^,⁸⁸^,⁹⁰, 10 used INH + rifapentine²⁸^,³⁰^,³¹^,³³^,⁴²^,⁴⁵^,⁴⁹^,⁵⁰^,⁵²^,⁸³, eight used rifampicin + pyrazinamide²⁴^,²⁹^,⁴³^,⁴⁷^,⁵¹^,⁶³^,⁶⁸^,⁸⁹, and three used rifampicin + INH + pyrazinamide + ethambutol⁴⁶^,⁴⁹^,⁷⁴. The drug combinations that were used less frequently for TB prophylaxis were rifampicin + INH²⁴^,⁴⁰^,⁶⁷, rifampicin + ethambutol ⁷⁰, and rifampicin + INH + pyrazinamide ²⁴^,⁶⁸^,⁷⁴.

● INH use prevalence

Five studies that fulfilled the inclusion criteria reported separately the number and proportion of individuals who used INH for 6 and 9 months: 51 (41.8%) for 6 months, 26 (21.3%) for 9 months, and 22 (18.0%) for 6 months²⁴; 181 (9.1%) for 6 months and 1674 (84.0%) for 9 months⁴³; 7332 (54.9%) for 6 months, 4298 (32.2%) for 9 months; 263 (2%) for ≤ 4 months⁶⁷; 466 (77.8%) for 6 months and 80 (13.4%) for 9 months⁷⁴; 1 (4%) for 6 months, and 3 (13%) for 9 months⁵³.

A large variation in INH use prevalence was observed in studies that did not distinguish the duration of treatment: 68 studies reported 0.3% to 98.6% of the study participants used INH for LTBI; 15 (22.1%) had prevalence within the range of the 1st quartile, 13 (19.1%) in the 2nd quartile, 17 (25.0%) in the 3rd quartile, and 23 (33.8%) in the 4th quartile²⁵^-⁴²^,⁴⁴^-⁵²^,⁵⁴^-⁶⁶^,⁶⁸^-⁷³^,⁷⁵^-⁹⁵ (Supplementary Table 3).

● Treatment adherence

In the 52 studies that similarly reported measurements for adherence to treatment with INH, a large variation was observed, both in the number of participants-ranging from 5 to > 12,000 individuals-and in the adherence rate, which ranged from 18% to 100% of study participants completing INH treatment for LTBI. The studies conducted in Europe had were more consistent adherence estimates with similar magnitudes when compared to other continents (Figure 3 and Supplementary Table 3).

FIGURE 3:
Treatment adherence in continents.

One (2.0%) study reported an adherence rate within the range of the 1st quartile, 10 (19.2%) in the 2nd quartile, 25 (48.1%) in the 3rd quartile and 16 (30.8%) in the 4th quartile²⁵^-²⁷^,²⁹^-³¹^,³³^-³⁸^,⁴⁰^-⁴²^,⁴⁶^-⁵²^,⁵⁴^-⁶¹^,⁶³^-⁶⁵^,⁶⁷^,⁷⁰^-⁷³^,⁷⁷^-⁷⁹^,⁸⁰^-⁸⁴^,⁸⁷^,⁸⁸^,⁹⁰^,⁹¹^,⁹⁵.

Eight studies reported that INH treatment adherence rates differed from those in most studies, such as individuals who purchased doses, received 180 doses over the 7-month period, were compliant with therapy, completed < 6 months of treatment, completed 6 months and failed to complete the final 3 months²⁴^,³²^,³⁹^,⁴³^,⁴⁴^,⁴⁵^,⁶²^,⁹⁴. Twelve studies did not assess adherence to treatment with INH²⁸^,⁵³^,⁶⁶^,⁶⁸^,⁶⁹^,⁷⁴^,⁷⁵^,⁸⁵^,⁸⁶^,⁸⁹^,⁹²^,⁹³.

● INH adverse events

An analysis of the types and frequencies of adverse events associated with INH was heterogeneous among the studies included in this review. In 38 studies, the most frequent events reported were hepatotoxicity, gastric intolerance, and neuropathy, the occurrence rates of adverse events from INH, ranged from < 1% to 48%²⁴^,²⁵^,²⁶^,³⁰^,³¹^,³³^,³⁴^,³⁷^,⁴⁰^,⁴¹^,⁴²^,⁴⁵^,⁴⁷^,⁵⁰^,⁵¹^,⁵⁴^,⁵⁶^-⁵⁸^,⁶²^,⁶³^,⁶⁴^-⁶⁶^,⁶⁸^,⁷¹^,⁷³^,⁷⁶^-⁷⁹^,⁸¹^-⁸³^,⁸⁶^,⁸⁸^,⁸⁹^,⁹¹^,⁹⁵ (Supplementary Table 4). Two studies analyzed but did not identify adverse events among the participants⁵⁵^,⁶⁰.

The occurrence of adverse events from INH was not analyzed in 32 studies²⁷^-²⁹^,³²^,³⁵^,³⁶^,³⁸^,³⁹^,⁴³^,⁴⁴^,⁴⁶^,⁴⁸^,⁴⁹^,⁵²^,⁵³^,⁵⁹^,⁶¹^,⁶⁷^,⁶⁹^,⁷⁰^,⁷²^,⁷⁴^,⁷⁵^,⁷⁷^,⁸⁰^,⁸⁴^,⁸⁵^,⁸⁷^,⁹⁰^,⁹²^-⁹⁴.

● Treatment effectiveness

The effectiveness of INH treatment for LTBI was measured by a diagnosis of active TB; heterogeneity was observed in the follow-up period of the participants to identify this outcome; some researchers followed up only during INH use, others continued to follow up the participants after the end of treatment or used infectious disease reporting systems to identify TB activation in those who used INH for LTBI.

Regarding the assessment of active TB development during and/or after a follow-up period after INH use for LTBI, 20 studies reported a variation from < 1% to 19.7%, with the highest rate among HIV-positive individuals who evolved to active TB after preventive therapy. In other participants, the rates did not exceed 10%, and most remained below 5%²⁸^,³⁶^,³⁷^,⁴⁹^,⁵⁶^,⁵⁷^,⁶¹^-⁶³^,⁷¹^,⁷⁵^,⁷⁶^,⁷⁹^,⁸⁰^,⁸³^,⁸⁵^-⁸⁷^,⁸⁹^,⁹³. Another 17 studies evaluated the effectiveness of INH treatment and did not identify active TB after the follow-up period³⁰^,³⁴^,⁴¹^,⁴⁶^,⁴⁸^,⁵⁰^,⁵³^,⁵⁵^,⁶⁰^,⁶⁶^,⁷²^,⁷³^,⁸⁴^,⁸⁸^,⁹¹^,⁹²^,⁹⁴ (Supplementary Table 5).

Thirty-five studies did not assess INH effectiveness as a preventive therapy for TB with INH²⁴^,²⁶^-²⁷^,²⁹^,³¹^-³³^,³⁵^,³⁸^-⁴⁰^,⁴²^-⁴⁵^,⁴⁷^,⁵¹^,⁵²^,⁵⁴^,⁵⁸^,⁵⁹^,⁶⁴^,⁶⁵^,⁶⁷^-⁷⁰^,⁷⁴^,⁷⁷^,⁷⁸^,⁸¹^,⁸²^,⁹⁰^,⁹⁵^,⁹⁰.

● Methodological quality analysis

In general, the studies included in this systematic review demonstrated fair methodological quality. Thirty-six studies were considered to have good methodological quality²⁵^-²⁸^,³²^,³⁴^,³⁹^,⁴¹^,⁴²^-⁴⁴^,⁴⁶^,⁴⁷^,⁴⁹^,⁵⁰^,⁵²^,⁵⁴^,⁵⁸^,⁶¹^,⁶²^,⁶⁴^,⁶⁶^-⁶⁸^,⁷⁰^,⁷⁴^,⁷⁷^,⁷⁹^,⁸⁰^,⁸¹^,⁸³^,⁸⁷^,⁸⁸^,⁹³ and 37 had “regular” quality²⁴^,²⁹^-³¹^,³³^,³⁵^-³⁸^,⁴⁰^,⁴⁵^,⁴⁸^,⁵¹^,⁵³^,⁵⁵^-⁵⁷^,⁵⁹^,⁶⁰^,⁶³^,⁶⁵^,⁶⁹^,⁷¹^-⁷³^,⁷⁵^,⁷⁶^,⁷⁸^,⁸²^,⁸⁴^-⁸⁶^,⁸⁹^,⁹⁰^-⁹²^,⁹⁴^,⁹⁵. The detailed results of the quality assessment using the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies for the 73 studies included in this systematic review are summarized in Figure 4 and Supplementary Table 6.

FIGURE 4:
Quality assessment of cross-sectional studies.

DISCUSSION

Although the efficacy of INH for TPT was first demonstrated > 60 years ago in randomized controlled trials conducted by the United States Health Services⁹⁶^,⁹⁷^,⁹⁸^,⁹⁹, to our knowledge, this was the first systematic review to investigate the use of INH for LTBI treatment and its safety, adherence, and effectiveness.

Rifapentine has been incorporated into the Brazilian Unified Health System and adopted within TPT strategies in other countries, and INH continues to be a recommended medication, both as monotherapy and in combination with rifapentine. Therefore, in the context of daily life, the safety, adherence, and effectiveness of this low-cost medicine continue to be relevant for health managers and professionals. In addition, it is worth highlighting the temporality impact of this review because the searches were concentrated in a period before the incorporation of the new TPT scheme.

LTBI treatment and systematic testing are strongly recommended in the guidelines for LTBI management worldwide, with evidence promoting an annual reduction of up to 10% in TB morbidity⁶^,¹⁰⁰. The profiles of patients using INH for LTBI reflect these guidelines, in which INH was predominantly administered to individuals at greater risk for developing the active disease such as those living with HIV, adult and child contacts of patients with pulmonary TB, patients initiating anti-tumor necrosis factor treatment, patients undergoing dialysis, and those preparing for transplantation⁶^,¹⁰¹.

The most studied outcomes were adverse events resulting from medication use and treatment adherence; fewer studies investigated the effectiveness of INH treatment as a preventive action against active TB in the medium and long term. All these aspects of treatment are relevant to the control and eradication of active TB worldwide; as such, it is important to determine the period during which individuals remain without risk for developing active TB.

The prevalence of INH use varied considerably among studies. As monotherapy with INH for 9 months was the most frequent, other anti-TB drugs, such as R and/or P, were also analyzed. Globally, INH regimens for 6 or 9 months are options; however, despite their proven efficacy, they carry a higher risk of toxicity and lower treatment completion rates, which reduces their efficacy. Nevertheless, there is a consensus that a 9-month regimen of INH therapy has been adopted as the standard comparator to assess shorter-course schedules¹⁰².

Adherence to INH treatment among the study participants varied greatly and was measured in most studies by treatment completion. This variation in the proportion of individuals who completed treatment for LTBI has also been reported in other systematic reviews¹³^,¹⁰³. The most important factor for this treatment is the number of doses, not merely the duration of the treatment chosen⁸.

Although the importance for completion of LTBI treatment to control active TB globally is well-established in the literature and health services, adherence levels at treatment initiation and completion have been consistently suboptimal¹⁰⁴^,¹⁰⁵. Strategies have been adopted to increase treatment adherence rates such as reminder telephone calls before appointments, reminder cards delivered at the first appointment, and nursing home visits for participants who cannot physically attend appointments (s)¹⁰⁶.

Health professionals should seek strategies that best meet the profiles of patients treated with their service because adherence is a multifactorial activity. However, there is evidence that therapy-(treatment regimen) and disease-(duration) related factors have little or no impact on adherence¹⁰⁷.

It is important to emphasize that researchers and health professionals who want to measure treatment adherence, whether for LTBI or others, are clear about the existing methods and make use of them in their studies and/or health services and opt for those methods most consider reliable and practical.

We acknowledge that there is no perfect method and that multimeasure adhesion approaches may be the best solutions. In this context, approaches or methods for measuring treatment adherence can be both subjective and objective, including direct measures such as secondary database analysis, electronic medication packaging devices, pill counting, patient assessments, and self-reports. Subjective approaches often provide explanations for patient nonadherence, whereas objective measures contribute to a more accurate recording of a patient's behavior while taking medication¹⁰⁸.

The adverse events reported in these studies corroborate with those predicted in the literature and in the drug leaflet (product monograph); less than half of the study participants mainly experienced hepatotoxicity and gastric intolerance¹⁰⁹. A study from the Republic of Korea that analyzed data from a surveillance system for adverse events reported that among the anti-TB drugs, INH was the second most common in causing adverse events in patients (24%), with R being the first (28.7%). This systematic review, identified the most common adverse events were in the gastrointestinal system disorders (32.0%), followed by skin and the limbs (25.9%) and the liver and biliary system (14.2%)¹¹⁰.

However, Campbell et al.¹¹¹ analyzed phase 2 clinical trials and reported that a 4-month regimen of R resulted in approximately half of the INH adverse events during 9 months. Thus, the importance of surveillance and monitoring of treatment after the drug testing phases (phases 2 and 3 clinical trials) is noted for monitoring outcomes of the real-world level of treatment, especially those with evidence of a greater chance for causing adverse events.

The effectiveness of preventive active TB treatment can, be based on the screening of new TB cases in a population sample that underwent treatment for LTBI¹⁰³. Evaluation of INH treatment effectiveness was the outcome of less interest in the studies included in this review, which may be explained by the high cost of developing studies that conduct long-term participant follow-up and the need for laboratory screening over time to identify active disease.

Some of the included studies used approaches that made it possible to identify the relationship between the effectiveness and use of the drug because they evaluated both the activation of TB during INH use and followed the participants for a prolonged period after the completion or abandonment of treatment; thus it was possible to correlate treatment completion and active TB development. This type of assessment has positive potential in TB control and may be incorporated into health services as a treatment assessment tool and a quick-action measure in patients who may experience activation of M. tuberculosis bacterium¹¹².

Although studies in three languages were included, a limitation of this systematic review was language bias due to the non-inclusion of studies published in other languages from countries with a high burden of TB infection, such as studies published in French, Russian, Hindi, and Mandarin¹¹³. Some articles (22) were not included because they required payment for access, and we had limited resources, or because they were not available in full, which could have impacted the results presented in this review. Adherence, safety, and effectiveness were either underestimated or overestimated. Another limitation was the methodological heterogeneity in identifying and reporting results, which limited direct comparisons between studies and, consequently, meta-analyses of the data.

Thus, we encourage future researchers to adopt clear and widely accepted definitions in the literature for treatment adherence and adverse events as well as the implementation of validated instruments to identify these outcomes, such as the Naranjo algorithm¹¹⁴^,¹¹⁵. The prevalence, use, and outcomes of other drugs that were not used as descriptors for the search strategy may have been underestimated.

Modeling studies have suggested that without linking the diagnosis and treatment of both active TB and LTBI, it will not be possible to achieve the targets for reducing TB cases by 2025 or its elimination by 2050¹¹⁶. The results of this review may help the scientific community improve methods and outcomes of interest for future evaluations of INH treatment for LTBI, as well as for health managers to understand the high use, safety, adherence, and effectiveness of INH treatment, its positive impacts, and the difficulties that need to be overcome for TB preventive treatment.

Understanding the treatment for LTBI is important to identify ways that can help health mangers and services, and the general population improve prophylactic treatment with INH and consequently promote a reduction in TB transmission rates. Our findings indicated that INH has been widely used in the world as a prophylactic treatment for TB, with INH adherence rates > 50%. It is important to emphasize the importance of maintaining follow-up of patients who use INH because of the risk of developing adverse events from the drug. Despite the treatment challenges, we identified low rates of patients who used INH and developed active TB during the follow-up period. We believe that INH continues to contribute to TB control worldwide. The included studies demonstrated good prevention rates for active TB and that better care is needed, such as expanding access to treatments with safe regimens, improving therapeutic convenience for the patients, and more structured, frequent monitoring services for these patients.

ACKNOWLEDGMENTS

We thank the researchers Ana Carolina Corrêa da Costa Sampaio, Jéssica Aires de Santana da Conceição, Luiza Habib Viera Garcia e Nailê Tassiara Calegaro for their contribution in extracting data from the studies included in this review.

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Financial Support: The researchers received financial support (financial aid for graduate students) of Decanato de Pós-Graduação (DPG) da Universidade de Brasília (UnB).

Publication Dates

Publication in this collection
25 Mar 2024
Date of issue
2024

History

Received
25 Oct 2023
Accepted
09 Feb 2024

This is an open-access article distributed under the terms of the Creative Commons Attribution License

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